Thermochemistry Assignment

April 20, 2016

1. Calculate the change in enthalpy for the following reaction using bond energies.

C2H4 (g) + 3 O2 (g) → 2CO2(g) + 2 H2O(l) ∆H = ???

2. Calculate the change in enthalpy for the following reaction using formation energies.

2C6H14 (g) + 19O2(g) →12CO2 (g) + 14H2O (g) ∆H= ???

3. Use Hess’s Law to determine the change in enthalpy for the following reaction.

2N2 (g) + 5O2 (g) → 2N2O5 (g) ∆H= ???

(1) H2(g) + 1/2O2(g) → H2O(l) ∆H= -285.8 kJ

(2) N2O5(g) + H2O(l) → 2HNO3(l) ∆H= -76.6 kJ

(3) 1/2N2 (g) + 3/2O2(g) + ½ H2(g) → HNO3 (l) ∆H= -174.1 kJ